In a thermoacoustic system, such as a flame in a combustor, heat release oscillations couple
with acoustic pressure oscillations. If the heat release is sufficiently in phase with the …

The large-scale coherent motions in a realistic swirl fuel-injector geometry are analysed by
direct numerical simulations (DNS), proper orthogonal decomposition (POD), and linear …

The study of the vibrational modes and stability of a given physical system is strongly tied to
the efficient numerical evaluation of its eigenvalues. The operators governing the …

The presence of elongated streaks of high and low streamwise velocity in the shear layer of
circular jets breaks the axisymmetry of their steady-state solution. If the streaks are …

First-order sensitivities and adjoint analysis are used widely to control the linear stability of
unstable flows. Second-order sensitivities have recently helped to increase accuracy. In this …

We present an adjoint-based method for the calculation of eigenvalue perturbations in
nonlinear, degenerate and non-self-adjoint eigenproblems. This method is applied to a …

We study the flow past a sphere rotating in the transverse direction with respect to the
incoming uniform flow, and particularly consider the stability features of the wake as a …

Flow through a sinuous stenosis with varying degrees of non-axisymmetric shape variations
and at Reynolds number ranging from 250 to 750 is investigated using direct numerical …

The three-dimensional flow past a fixed sphere placed within a uniform stream is
investigated. This paper focuses on the second bifurcation, which is responsible for the …

The optimal energy amplifications of streamwise-uniform and spanwise-periodic
perturbations of the hyperbolic-tangent mixing layer are computed and found to be very …